Aftermath by Kelley Armstrong

Three years after losing her brother Luka in a school shooting, Skye Gilchrist is moving home. But there’s no sympathy for Skye and her family because Luka wasn’t a victim; he was a shooter.

Jesse Mandal knows all too well that the scars of the past don’t heal easily. The shooting cost Jesse his brother and his best friend–Skye.

Ripped apart by tragedy, Jesse and Skye can’t resist reopening the mysteries of their past. But old wounds hide darker secrets. And the closer Skye and Jesse get to the truth of what happened that day, the closer they get to a new killer.